Furnace-front baffle construction



J. REID.

FURNACE FRONT BAFFLE CONSTRUCTION.

APPLICATION FILED MAR. 3,1919.

2 SHEETSSHEET I. V

Patented Aug. 24,

lnvernkbzf XML! Mlbmey J. REID.

FURNACE FRONT BAFFLE CONSTRUCTION.

APPLICATION FILED MAR. 3,1919.

2 SHEETSSHEET 2.

Patented Aug. 24, 1920.

AKh'Mncy UNITED STATES x JOHN REID, or NEW YORK, N. Y.

Specification of Letters Patent.

PATENT OFFICE.

- rmmncn-rnonr BArrLE CONSTRUCTION.

Patented Aug. 2-1, 1920.

Application filed March 3, 1919. Serial No. 280,410.

To all whom it may concern Be it known that I, Joni: REID, a subject of the King of Great Britain, and residing at 30 Church street, in the city of New York trated in the accompanying drawings, that form part of the same.

The invention consists essentially of the novel construction and arrangement of the baffles on the fire box side of the front.

The objects of the invention are to eliminate, as far as possible, the destruction of the back plate through the failure of the battles to accomplish their purpose; to furnish a refractory member that will not readily scale; to avoid accidents at sea due to-the delays from injuries incident to the sudden overheating of exposed plates in furnace fronts; to insure regularity in the generation of steam; to efficiently complete the structures described in my Patents 1,297 ,247

dated March 11, 1919, and 1,318,331 dated October 7,1919; to provide in a furnace fronta baille assembly and construction that will effectively resist the heat and that will endure for a comparatively long period.

In the drawings, Figure 1 is an elevation of the back plate on the fire box side, showing. the baffles in their preferred positions.

Fig. 2 is anenlarged detail of the upper central baffle.

Fig. 3 is a cross sectional View through the said-upper baille.

Fig. 4 is an enlarged bottom plan view of the baffle forming a yoke between the side or wing baffles. r f r Fig. 5 is an enlarged sectional view of the yoke piece; 1 i Fig. 6 is a cross sectional View of the upper baffle, showing the grid riveted to. the

base plate of the bafHe. V

. showing another meansemployed for hold-1 ing the refractory coating.

,Fig. 8 is a detail view in vertical section, showing the relations between the front plate, the back plate, the tenon and one of the filleted upper corners.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, the numeral 1 indicates the upper baffle covering the exposed surface of the back plate 2 from side to side and from the top down to the fuel passage 3.

The side or wing baffles f and 5 cover the exposed surface of the back plate 2 from the baffle 1 down to the fire box level, as indicated by the structural supports 6 and 7.

T he yoke baffle 8, which is located beneath the central portion of the upper baffle 1 and between the upper portions of the side baffles l and 5, covers the back plate at the in ner end of the fuel passage. The baffle 1 has a straight lower edge and the baflles a and 5 have straight inner vertical side edges. The yoke battle 8 conforms to the configuration of the space defined by the adjacent edges of the baffles 1, 4 and 5. The inner side faces of the sides of the yoke battle 8 are curved and the sides terminate in the tenoned ends 10 meeting ateach side the tenon shoulders of the plates 11 and 12 secured to the side baffles d and 5, said yoke baffle being bolted to the baffle 1.

It will now be seen that the back plate of the furnace front within the fire box and forming the front wall thereof is covered by a particular arrangement of baffle plates, which are constructed in a special manner as set forth in detail hereinafter.

The door baille 18 is arranged in its customary position and with the baflles 1, at, 5 and 8 completes the protective covering for the otherwise exposed surface of the back plate 2 and the door.

Each baille in the arrangement described is made with a base plate 14, having a considerable number of suitably spaced holes.

The baflies are provided with grids and the grid 16 in one form is shown with the square. meshes 17 and the crossed bars 18 preferably inwardly flanged at 19 to form pockets of said squares, the latter being formed to register with the arrangement of holes 15, so that each square will have. a central hole leading therefrom through the base plate 14. -The grid 16 is secured to a base plate 14 by the bolts 20 and nuts 21, though it may be secured by rivets or in the casting process.

The squares orpockets 17 are filled with a refractory and plastic substance 22 such as asbestoscement and in this filling a central hole 23 is made, which corresponds and registers with the holes and the whole may be surrounded by an outer wall 24.

, As before explained, the side, baffles l and 5 are formed and placed to receive the baffles 11 and 12 tomeet the yoke 8, andthe latter contains the gridsurface construction on the under side, so far as it can be applied thereto.

The baflie construction thus described applies particularly to'that class of furnace plate and side or wing platesare joined by fronts for structures known in practice as the Scotch type of forced draft furnaces and it is particularly suitable for theback plate of said type-of front, as the upper the yoke plate and these with the doorplate cover all surfaces, which would otherwise be exposed. p

The specific construction of the grid and l refractory pockets is very important though other means for anchoring refractory material has been known heretofore.- This invention is concerned largely in practical methods to standardize furnace fronts, in order to effect economyand despatch-in production and with this in view, a cast base plate is provided with a grid which -with the base plate forms pockets of any suitable shape and here shown as squareand this grid is preferablyfixedto the base plate in sucha way as to be removabletherefrom, thereby furnishing a meansof readily renewing' the refractory substance, though it is likelyto last for a considerable period and also to stand a great heat, in view of the warping and cracking and makingit practi cal to have a comparatively thin baseplate.

7 This mat also forms a splendid additional anchor for the refractory paste. This is especially important where there may be a smalll space of the mat not covered by the rlc. f v p The grid may be made of strips bolted together as shown in Fig; 8 and in this form I of'the invention the flexible-strips '25 are drawn together and secured by the bolts 26,

rivetsor other means of fastening, thereby forming the pockets 2 7.

--Itwill thus be seen that the castgrid or themalleable or machined grid may be used with approximately equal efficiency, though for eheapness and effectiveness, itwillbe dlflicult to equal the cast grid bolted to the base'plate, as thatfacilitates both the installation and repairs in furnace fronts and there is a certain rigidity about the cast metal, that combines well with the refractory nature of. the fibrous cement, the two' presenting a solid front almost impregnable in resisting the gases. 7 a

The yoke featur of-this invention is of great service, so far-as durability is concerned,for the corners and edges of the back plateat the fuel passage are'almost universally neglected and consequently burnt out first, which destroys the whole front in solid cast fronts, but the new arrangement of baffles overcomes this difficulty and-no part of the'back plate within the fire box is left without protection. 7

Various changes may be made 1n the construction'and some in the arrangement for different types of front, so long as they are 'within the scope of'the claims for novelty following. i

vYVhat I claim is r I 1; In furnace' front baffle construction, a

back plate forming the inner front wall of the fire box and having a fuel opening, a

plurality of 'baffiespartially covering said walls and situated Von-the back plate of the furnace front above'and on either side of'the fuel-passage-opening and a yoke plece bridgring the distance across said fuel opening at theupper end thereof and covering the portion of said wall leftuncovered by the aforesaid baflies.

'2. In furnace front construction, a back plate forming the'inner front wall of the fire box and having a fuel opening, an upper baflie secured to said plateabove the fuel opening, side or wing baffles below said.

upper baffle and a yoke baffle secured to said upper baflie and filling in the corners formed by said side bafl'les and saidupper baffle, said baffles forming a refractory covering for said front wall. I V f 3. -111- furnace front, baffle construction, a

back plate forming the inner front wall of the'fire box and having a fuel opening,-an

upper baffle secured to said back plate above the fuel opening, a pair of-side or wing baflies extending downwardly from said.

upper baffle, one on each 'side of the fuel opening, filling side plates secured to said wing platesand having. tenon shoulders, a yoke piece extending across the upper end of the fuel opening and filling in the corners formed by said upper and side baffles and having tenon' ends 'meeting the aforesaid 'tenon'shoulders, saidb afiles forminga refractory covering for said-inner front wall, and a doorbaffle completing the baffle equipment. 7 r

base plate having holes therethrough, a grid in mesh form rigidly secured to said base plate, and' forming pockets with the same, and refractory substance in. said pockets r V .41. In furnace front baflle construction, a 1

having holes therethrough registering with the aforesaid holes.

5. In furnace front bafiie construction, a base having a plurality of holes, a grid in crossed bar form secured to said base having flanges forming retaining lips, and refractory material filling said grid and having holes therethrough corresponding to and alining with the aforesaid holes.

6. In furnace front baiiie construction, a base plate having a plurality of holes, a refractory substance holder rigidly secured to said base plate and formed with a plurality of adjoining apertures suitably shaped to re tain the substance, a plastic substance of a refractory nature and filling said apertures having holes therethrough registering with the aforesaid holes, and fastening members for securing said holder to said base plate.

7. A furnace baffle construction comprising a supporting plate, having openlngs therethrough, a member provided with openings secured to said plate and masses formed from fibrous refractory plastic material in the openings in said member, said member and masses being provided with openings registering with the openings of the supporting plate.

8. In furnace front bafile construction, a base plate forming a grid support, an asbestos mat mounted on'said base and correspondingly shaped to said base plate and forming the means of separating the base from the grid, a grid mounted on said mat and adapted to receive a plastic substance, fasteners securing said grid to said base plate and refractory plastic substance in said grid.

Signed at the city of New York this 13th day of Feb, 1919.

JOHN REID. 

